Bought BTC in early July, cashed out recently at 600% my initial investment. Some of it's gone towards Christmas presents, and I'm going to put the rest into a side project for (hopefully) a more stable source of semi-passive income.

9 days ago there was a thread for 2017, too https://news.ycombinator.com/item?id=15869527 (didn't start with 'Ask HN')